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JRM Vol.28 No.4 pp. 509-522
doi: 10.20965/jrm.2016.p0509
(2016)

Paper:

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Control of Low-Cost Customizable Robot Arm Actuated by Elastic Tendons

Junki Togashi*, Kazuhisa Mitobe*, and Genci Capi**

*Department of Mechanical Systems Engineering, Yamagata University
4-3-16 Yonezawa 992-8510, Japan

**Department of Mechanical Engineering, Hosei University
3-7-2 Kajinocho, Koganei, Tokyo 184-8584, Japan

Received:
February 23, 2016
Accepted:
April 15, 2016
Published:
August 20, 2016
Creative Commons License
Keywords:
tendon-driven robot arm, low-cost robot mechanism, elastic tendon, force control, marionette-type robot arm
Abstract
This paper presents a low-cost, lightweight robot arm with very low stiffness actuated by elastic tendons. To simplify the string tension control, a new winding device was developed. Small pulleys were incorporated into the winding drum to reduce friction between the tendon and the drum. A marionette-style two-link robot arm with compliant joints was prototyped. Because the arm and winding devices were separate from each other, the cost and weight of the robot were reduced. The links are made with lightweight wood connected by simple shaft joints. The robot design can be easily modified by the user because the mechanical parts do not require high machining accuracy. This robot is intended for implementation in tasks that do not require high positioning accuracy using a simple force control under environmental constraints. Because of its low stiffness, simple and sensor-less force control can be easily implemented based on the relationship between forces under static conditions. The proposed simple control method was evaluated experimentally by conducting position, static force, and hybrid position/force control tasks and was shown to perform well. The results also demonstrate that employing additional sensors, such as a camera, improves the accuracy of the controller.
Elastic tendon driven robot arm

Elastic tendon driven robot arm

Cite this article as:
J. Togashi, K. Mitobe, and G. Capi, “Control of Low-Cost Customizable Robot Arm Actuated by Elastic Tendons,” J. Robot. Mechatron., Vol.28 No.4, pp. 509-522, 2016.
Data files:
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